Asymmetric Twisting of Coronal Loops

The bright solar corona entirely consists of closed magnetic loops rooted in the photosphere. Photospheric motions are important drivers stressing, which eventually leads to energy release into heat. These chaotic and obviously different from one footpoint other, fact, there is strong evidence that finely stranded. One may also expect transient variations along field lines, but at a glance, coronal ever appear more or less uniformly other. We aim understand how much can preserve their own symmetry against asymmetric boundary expected occur loop footpoints. investigate this issue by time-dependent 2.5D MHD modelling loop, including its rooting beta-variation assume flux tube stressed rotation has pattern In way, we force asymmetries because independent evolution strands. found until Alfvén crossing-travel time relative entire length lower than twisting period, loop’s depends only on velocity between boundaries, efficiently preserved. conclude very high velocities characterise environment explain why maintain degree even when they subjected photospheric for long time.